Spring-tooth harrow



(No Model.) W. E. SMITH.

SPRING TOOTH HARROW.

No. 486,796. y Patented, Nov. 22,1892.

l UNITED STATS PATENT OFFICE.

WILLIAM E. SMITH, OFWATKINS, NEWV`YORK.

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 486,796, dated November 22, 1892.

` Application led January 27, 1892. Serial No. I19,451. (No model.)

To a/ZZ whom it may concern:

Be it known that I, WILLIAM E. SMITH, a citizen of the United States, residing at VV-atkins, Schuyler county, New York, have invented certain Improvements in Spring-Tooth Harrows and Adjustable Ratchet-Fastenings to hold the Teeth to the Frame, and thereby Regulate the Depth of Cnt, of which the following is a specification.

My invention relates tospring-tooth harrows, and has for its object to provide means for readily adjusting the spring-teeth and to furnish a cheap, simple, and effective harrow which is not liable to get out of order; and to these ends my invention consists in the various features of construction and arrangement of parts, substantially as hereinafter more particularly set forth.

Referring to the accompanying drawings, forming part of this specitication, Figure lis a perspective view of a harrow embodying my invention. Fig. 2 is a longitudinal section of the tooth-holder or ratchet-gear. Fig. 3 is a transverse section of the same, and Fig. 4 is a perspective detail showing means for holding the tooth.

The barrow-frame is made in two parts hinged together, each part being composed of a number of bars of metal, preferably steel, secured together to form a rigid frame. Thus in the drawings I have shown three longitudinal bars A and three transverse bars B riveted together, and in order to further produce a rigid frame I provide a number of braces C, extending between the transverse bars, and of course there may be any desired number to render the harrowsufficientlyrigid. Mounted on the transverse bars are the tooth-holders D, and these are secured in any suitable way to the frame, as by rivets. These tooth-holders consist of a chair or clip E, which may be of cast or malleable iron, or can bea bent steel bar. Mounted in this chair or clip are the tooth-holding plates F F. These plates are provided with inwardly-projecting lugs in the forni shown in Fig. 4. Thus there isa lug a, extending in the line of a chord across the face of the plate below its center, adapted to receive the under side of the tooth T, and

5o above this, substantially in line with the central opening in the plate, are two smaller lugs b c, adapted to bear upon the upper surface of the tooth, and in order to prevent longitudinal movement of astraight portion of the tooth I provide a projection d, (shown in the forni of a triangle,) which takes into a recess correspondingin shape in the side of the tooth. It will thus be seen that when the tooth is placed between the plates F and F and these plates are drawn together the tooth will be securely held in position against longitudinal or other movement.

In order to secure the teeth in the plates F, I provide a bolt G, passing through the boltholes gin the plates and the holes e e in the sides of the clip. One of the plates, as F, is provided with an enlarged shoulder-bearing F, which ts in the enlarged openinge in one side of the clip and is recessed to receive the bolt-head G, while the screw-threaded end of the bolt passes through the other side of the clip and is secured by a nut G2.

'It will thus be seen that when the nut G2 is tightened the plates F and F will be drawn together, tightly clamping the vtooth between their adjacent sides, and at the same time the plate F will be held in close contact with the inner side of the clip E, so that the tooth will be rigidly supported. In order, however, to secure the tooth-holder against slipping, l provide the external face 0f the plate .F with ribs or ratchet-teethf, and also provide the corresponding inner face ot' the clip E with similar ratchet-teethf, so that when the parts are brought together and secured by the bolt the tooth-holder cannot `be turned. It', however, it is desired to adjust the tooth to regulate the depth of the cut or the projection ot' the tip end of the tooth, all that is necessary is to loosen the nut G2 and turn the toothholder in the clip, so as to bring the tooth at the desired position, when it is again tightened, the ratchet-teeth securely holding il; in its adjusted position. Thus it will be seen that any one or all of the barrow-teeth can be adjusted to have the same ordifferentdepths of cut, and if the teeth wear at their points they can be adjusted to compensate for such wear.

Having thus described my invention, what I claim isl. In a spring-tooth harrow, the combination, with the clip, of the plates Afor holding the tooth, one of the platesbeing provided with IOO a projection fitting an opening in the clip and having a recess for the head of the bolt, and a bolt passing through said plates and clip, and a nut outside the clip for securing said bolt and clip, substantially as described.

2. In a spring-tooth har-row, the combination, with the clip provided with ratchet-teeth on the inner side of one of its faces, of the adjustable plates mounted in the clip, one of the plates having a projection fitting an opening in the clip and the other plate having ratchetteeth on its outer side tting the ratchet-teeth in the clip, and a bolt passing through the platesand secured to oneside of the clip, substantially as described.

In testimony whereof I have signed my naine to this specification in the presence of two subscribing witnesses.

WILLIAM E. SMITH.

Witnesses:

JOHN P. MELICK, H. F. HOLLER. 

